These are the release notes for the 1.0.0 version of the specification.
@context and for the vocabulary terms in favour of the namesspace https://coar-notify.netobject property to the "acknowledgement" and Undo patterns: Accept, Reject, TentativeAccept, TentativeReject & UndoinReplyTo to Undo pattern.origin and target types to Serviceid in object explicitsubject to Reject, TentativeAccept, TentativeReject and Undo patternsactor property in all notificationstype in object when the object is a web resource.type in object - it is now recommended to use a value from schema.org, but not required.